Edje OT (1980) Comparative development and yield and other agronomic characteristics of maize and groundnut in monoculture and in association. In: Proceedings of second symposium on Intercropping in semi-arid areas, held at Morogoro Tanzania, Pp.4-7.

Nnko EN, Doto AL (1980). Intercropping maize or millet with soybean, with particular reference to planting schedule. Proc. Second Symposium on intercropping in semi-arid areas, held at Morogoro, Tanzania. 33:168.

Odo PE (1984). Evaluation of short and tall sorghum varieties in mixtures with cowpea in the Sudan Savanna of Nigeria: Land equivalent ratio, grain yield and system productivity index. Exp. Agric. 27:435-441.http://dx.doi.org/10.1017/S0014479700019426